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f 25 drawings, forming a part of this s'pecicati'on,

N UNITED STATES ensTAv n'YER, or* scnNEBEcK, GERMANY, y.'fissrenon To THE FAHRRAD:

WELTRAD, VORMALS HOYER GLAHEHQF-SAME' PLACE;` n

srncrnrcn'rron forming para of Letters rate'nt No. 604,863, dated may .31, 189e. I Application filed August 13,118777-i' Serial No. B48,1v12,-v.(No'xnode1-.-) y i ject ofthe King of Prussia, Emperor of Grer-v many, residingat Schnebeck-0ntheElbe, in the Kingdom of Prussia,German'Empire,have invented an Improvement in Pipe-Joints, of

which the following is a specification.

States Letters Patent led January 23, '1896, and bearing serial-nu-neber'576,505.

In practice vit has .been foundthat there is a tendency to fracture the inner section of the joint when expanded outward vto fill the conf caverecesse's or grooves in the outer pipe,

and this I'entirely overcome and render the Ijoint more'rig-idby placing a reinforce-section .within theinner pipe.

In orderthat those skilled in the art to which this invention appertainjs may understand how to make and use the same,;the construction and operation will no'vv be described i in detail, referring 'to the accompanying in vwhich Figure l is a section of a portion of the cast pipe prior to the boring .outof the` grooves, and Fig. 2 a sectionofajoint made in accord- 'ancewithniy present improvement.

In carryingout my invention'as herein embodiedI form upon-the section a the annular enlargements a', and these enlargements in the' case of a cast pipe are formed thereon in .the molding, and annular grooves are then bored therein from the interior of thefpipesection, and when this pipe is made other- 'A :wise-thanby casting the enlargements may be formed by expanding the pipe outward, thereby at the same time forming the annular internal grooves. "j

The lend ofthe section b is passed within vthe section a and a reinforce-section c placed vwithin the inner-end of the section bwhen'a suitable tool, such as that shown in the` abo'vereferred-to application, is inserted withinthe' joint and so operated aste expand both the.

reinforce-section andthe section b and cause certain portions thereof to iitv snugly withinv the grooves'of the enlargements a', as clearlyshown in Fig. 2'. Whenthis has been ae A complished, it is obvious that a perfect joint is formed. and that the sections a and'b canf not be withdrawn from each other, andthe action of the reinforce. will be to strengthen the"joint,'so"as to render 'it 'as`strong,"'if not' y more so, than any other portion'of the pipe.

' The prirne function ofthe reinforce is to v avoid the cramping'or 'fracturing of the 'sec tion b at thev points where it is expandedoutj ward into the annular grooves inthe section a, since by the use of this reinforce the expanding-toolwill come in contact therewith j and not in' contact -with the. section b, thus.

In a pipe-joint; an outerxsection having shallow annular grooves formed 'near the end.

7 thereof, an inner section fitting within the outer section and a reinforcing-section of uniform thickness throughout,- saidv reinforcingsection being permanently ttedin the innerl section, said inner and reinforcing sections being simultaneously pressed outward or eX- panded into the grooves of the outer section and at those points only, the Iiange produced by the. groove in the reinforcing-section being deeper in proportion than the other section, substantially as set forth.

In testimony whereof I hereunto set my hand in presence of two witnesses. v

GUSTAV HOYER,v

Witnesses:

W. HAUPT, HENRY .IIASBEIL 

